Organic fertilizers - improve soil fertility and enjoy abundant crops
Calcium fertilizers approved for organic farming — granulated lime that regulates pH and supports the rebuilding of humus and soil biological life.
Products in this category
Carbonate Lime
Granulated agricultural lime with the highest reactivity and a high CaCO₃ content, designed to quickly improve soil pH. Thanks to excellent solubility it rapidly unlocks the phosphorus and potassium stored in the soil. It improves the use of nutrients from mineral fertilization.
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Magnesium Lime
The ideal solution for magnesium-deficient soils, maintaining the optimal calcium-to-magnesium ratio. It ensures a stable field pH over the long term. It supports photosynthesis by replenishing magnesium, the central component of chlorophyll.
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Black Chalk
An innovative combination of lake chalk with organic carbon and humic acids. The product not only regulates pH but also supports water retention in the soil. It improves the soil's crumb structure and increases its ability to hold water in the root zone.
Discover Black ChalkFrequently asked questions
Find the key information about this fertilizer group. Match the product and rate to your soil test.
Are these calcium fertilizers allowed in certified organic farming?
The Bluebird organic category describes its calcium fertilizers as approved or intended for organic farming. A certified farm must confirm the current status of the specific product and its use with the product documentation and its certification body; this answer is not a blanket certification claim.
How do organic lime fertilizers support eco-schemes and sustainable farming?
Bluebird's products are described as regulating pH and, in the case of Black Chalk, supplying organic carbon and humic acids that support soil structure and water retention. These functions may support a farm's soil-management goals, but eligibility for a particular eco-scheme depends on its rules and cannot be inferred from the product description.
What documentation is required to use organic lime on certified organic farms?
The exact documents depend on the certifier and the applicable rules. Bluebird provides product data sheets, safety data sheets, EU declarations of conformity and technical specifications in its downloads section; use the current documents and confirm the required set with the certification body before application.
How fast does organic granulated lime adjust soil pH in ecological production?
The speed is not a fixed number: it depends on the product's reactivity, granule dissolution, moisture and soil type. Bluebird lists high reactivity for its calcium products and describes the granules as acting after they dissolve, but a soil test and label should guide expectations and timing.
How do organic carbon and humic acids help retain soil moisture during droughts?
In Black Chalk, organic carbon and humic acids are described as supporting aggregates and crumb structure. A more stable structure can help keep water in the root zone, although the effect varies with texture, organic matter, rainfall and the wider soil-management system.